Good point.
I heard that both the Boss and Villain were engineered for 3 train operation. Premeir (at the time) ordered 5 trains for the 2 coasters and didn't decide which one would get 3 till later.
(Boss got the 3.)
You said it Jeff! In August I saw 2 train stacking Villain. At the same time, the third Batman train was in the shed, but it didn't matter, they were stacking 2 quite nicely on it anyway.
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- Peabody